Re: Tom Knauff's newsletter

> I suspect that a yaw string, typically taped to the canopy, may have
> errors because the string is in the boundary layer.
>
> Tony V.

Closer than the OP, but still doesn't seem quite right. The front yaw
string is much more subject to 'crossflow effect' (on most ****ps) than
the back one due to canopy shape and the string's relative placement
on a compound curve that is sometimes splitting air striking it
(besides,  both strings are in the boundary layer...)
With this in mind, it is not a bad idea to "calibrate" ones yawstring
by comparing it's position relative to a panel mounted slip-skid ball
when flying a new ****p, perhaps even marking the coordinated positions
(at 45 deg banks?) with pinstripe tape if they are far off center.
Jonson also covers this in the previously mentioned article about
mildly slipping during thermalling turns (named "Circling the
Holighaus Way" http://www.owp.us/Johnson/CirclingTheHolighausWay.pdf
). He explains it much more elegantly than I and it is worth reading
if you have not already seen it.

-Paul